troop presence in afghanistan and the security of that country, hamid karzai having lunch with president obama this hour. the two leaders hold a news conference in the next hour. president karzai's visit will help determine how many u.s. troops will remain in afghanistan after the drawdown in 2014. chris lawrence joins us. the white house floated the idea of a zero option, if you like, leaving no troops behind in afghanistan. what's the pentagon think of that and a lot of these people say that really complaint hean'. >> i would say at this point everything is probably still on the table, but you're right, that number zero definitely raise some had eyebrows inside the pentagon. in fact during a press conference yesterday, leon panetta said the stronger position that we take about staying committed and staying in afghanistan, you know, that's how we're going to ultimately get a political reconciliation. in other words, he felt that signaling that the u.s. may pull out all of its troops would weaken the negotiating position about those negotiations with the taliban ever got started again. n